.frame {
  position: absolute;
  width: 400px;
  height: 400px;
  box-shadow: 1px 2px 10px rgba(0, 0, 0, 0.3);
  border-radius: 2px;
  background-color: #16a085;
  inset: 0;
  margin: auto;
  overflow: hidden;
  font-size: 0;
}

.center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.line {
  fill: none;
  stroke: #fff;
  stroke-width: 3px;
  stroke-linecap: round;
  animation: line 2.5s linear infinite;
}

.circle {
  position: absolute;
  box-sizing: border-box;
  width: 30px;
  height: 30px;
  inset: 0;
  margin: auto;
  border-radius: 50%;
  border: 4px solid #fff;
  animation: circle 2.5s ease-out infinite both;
}

@keyframes line {
  0% {
    stroke-dasharray: 50 660;
    stroke-dashoffset: 780;
  }
  100% {
    stroke-dasharray: 50 660;
    stroke-dashoffset: 70;
  }
}
@keyframes circle {
  0%, 50% {
    opacity: 1;
    transform: scale(0);
  }
  70%, 100% {
    opacity: 0;
    transform: scale(1);
  }
}